Baen still seems to be hanging in there. But they don't have (public) stockholders to answer to.

They're a genre-specific publisher that has spent years cultivating an audience and a stable of authors. In a lot of ways they are a lot closer to Campbell's Astounding than a modern publishing house. They're really an outlier.

Contrast them to Tor, who are totally cribbing from them but not getting the same kind of brand loyalty. Of course, having Sargent shoot his mouth off and undo a lot of their outreach is a pretty big handicap.